2.6.0
spase://NASA/NumericalData/LANL/2002/MPA/PT87S
LANL 2002 Magnetospheric Plasma Analyzer (MPA) at 87 sec Resolution in Spacecraft Coordinates
LANL 02A MPA data
https://doi.org/10.48322/z6y7-r007
2023-12-28T12:34:56.789
2021-04-27T15:38:11
Only known prior ReleaseDate of the metadata
2023-07-30T12:34:56.789
Added DOI and PublicationInfo minted by LFB, metadata versioned up to SPASE 2.6.0, reviewed by LFB 20230727
2023-12-28T12:34:56.789
Correct geosynchronous spelling as requested. Removed ftp link. Corrected CDAWeb url. JMW
The LANL 02A MPA data set contains numerical moments computed from measurements of the Los Alamos Magnetospheric Plasma Analyzer (MPA) [Bame et al., Rev. Sci. Inst., in press 1993]. The moments are presented in s/c coordinates: the z-axis is aligned with the spin axis, which points radially toward the center of the Earth; the x-axis is in the plane containing the spacecraft spin axis and the spin axis of the Earth, with +X generally northward; and the y-axis points generally eastward. Polar angles are measured relative to the spin axis (+Z), and azimuthal angles are measured around the z-axis, with zero along the +X direction. The moments are computed for three 'species': lop (low-ener. ions, ~1eV/e-~130eV/e); hip (hi-ener. ions, ~130eV/e-~45keV/e); alle (electrons, ~30eV - ~45keV ). The electron measurements are obtained 21.5 secs after the ion measurements. Epoch is the measurement time appropriate for the ions. The moments are computed after the fluxes are corrected for background and s/c potential. Algorithms for these corrections are relatively unsophisticated, so the moments are suspect during times of high background and/or high spacecraft potential. Because the determined spacecraft potential is not very precise, the magnitude of the low-energy ion flow velocity is probably not accurate, but the flow direction is well determined. Tperp and Tpara are obtained from diagonalization of the 3-dimensional temperature matrix, with the parallel direction assigned to the eigenvalue which is most different from the other two. The corresponding eigenvector is the symmetry axis of the distribution and should be equivalent to the magnetic field direction. The eigenvalue ratio Tperp/Tmid, which is provided for each species, is a measure of the symmetry of the distribution and should be ~1.0 for a good determination. Several of the parameters have a fairly high daily dynamic range and for survey purposes are best displayed logarithmically. These parameters are indicated by non-zero 'SCALEMIN' values in this file. A quality flag value of 1 indicates that the values are suspect because of unreliable location info.
Los Alamos National Laboratory; Dr. Michelle Thomsen; Dr. Michael G. Henderson
Thomsen, Michelle, F.; Henderson, Michael, G.
2023-01-01T00:00:00
NASA Space Physics Data Facility
spase://SMWG/Person/Michelle.F.Thomsen
PrincipalInvestigator
spase://SMWG/Person/Michael.G.Henderson
GeneralContact
spase://SMWG/Person/James.M.Weygand
MetadataContact
spase://SMWG/Person/Lee.Frost.Bargatze
MetadataContact
Los Alamos Nation Laboratory spacecraft Magnetospheric Plasma Analyzer
https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/93JA00726
Journal of Geophysical Research Article on the LANL MPA instrument.
spase://VMO/NumericalData/LANL/LANL2002/MPA/PT87S
spase://VMO/NumericalData/LANL/2002/MPA/PT87S
spase://VSPO/NumericalData/LANL/2002/MPA/PT87S
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Online
Open
HTTPS from SPDF
https://spdf.gsfc.nasa.gov/pub/data/lanl/02a_mpa/
In CDF via HTTP from SPDF
CDAWeb
https://cdaweb.gsfc.nasa.gov/pub/data/lanl/02a_mpa/
A2_K0_MPA
subset, plot, and ASCII list from CDAWeb.
CDF
LANL; Dr. Michelle Thomsen; Dr. Michael G. Henderson
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Online
Open
CDAWeb HAPI Server
https://cdaweb.gsfc.nasa.gov/hapi
A2_K0_MPA
Web Service to this product using the HAPI interface.
CSV
LANL; Dr. Michelle Thomsen; Dr. Michael G. Henderson
Calibrated
LANL 02A MPA
Numerical Data
spase://SMWG/Instrument/LANL/2002/MPA
EnergeticParticles
2003-10-29T00:00:00
2008-01-03T23:59:59
Time format in data files is: day, month, year hour, min, seconds. Ex: '01-Jan-1981 00:00:00.000'
PT87S
Flags=-1.0e+31. The content of the LANL SOPA cdfs at CDAWeb has not been fully documented.
87 sec
geosynchronous
LANL
Magnetospheric Plasma Analyzer
MPA
LANL 02A MPA Time of proton collection
Epoch
This is the time of the proton data collection (electrons 21.5 seconds later). Universal Time in data cell: day, month, year hour, min, seconds. Ex: '01-Jan-1981 00:00:00.000'.
Interval centered time tag
ms
'1.0e-3>s'
Epoch
01-08-1992T00:00:00.000
31-12-2020T23:59:59.000
-1.0000e+031
Temporal
LANL 02A MPA Time of proton collection
Time_PB5
This is the time of the proton collection (electrons 21.5 seconds later). Time in the format: year, day of year, and second of the same day.
Interval centered time tag
PT87S
Epoch
3
Date and Time Vector.
Year
1
Years
1992
2020
Day of Year
2
Days
0
366
milliseconds of the day
3
ms
0
86399000
-2147483648
Temporal
LANL 02A MPA Partial Density of Low Energy Ions
dens_lop
Partial density of low energy ions (1-130 eV/e).
cm^-3
1.0e6>m^-3
low p dens
0.1
1000.0
0.0
100000.0
-1.0000e+031
Ion
Scalar
NumberDensity
1
130
eV/e
LANL 02A MPA Velocity Vector Low-Enery Ions
vel_lop
Velocity vector low-enery Ions (1-130 eV/e) in spacecraft Coordinates in units of km/s.
km/s
1.0e3>m s^-1
Cartesian
SC
-100
100
3
VX
Component.I
1
VY
Component.J
2
VZ
Component.K
3
-2000
2000
-1.0000e+031
Ion
Vector
Velocity
LANL 02A MPA Temperature Low Energy Ions
temp_lop
Temperature of low energy ions (1-130 eV/e).
eV
low p temp
0.1
100.0
0.0
50000.0
-1.0000e+031
Ion
Scalar
Temperature
1
130
eV/e
LANL 02A MPA Ratio of Temperature Eigenvalues for Low-E Ions
tratio_lop
Ratio of temperature (Tperp/Tmid) of low energy ions (1-130 eV/e).
Tper/Tmid
0.1
10.0
0.0
100.0
-1.0000e+031
Ion
Ratio
Temperature
1
130
eV/e
LANL 02A MPA Partial Density High-E Ions
dens_hip
Partial density of high energy ions (.13-45 keV/e).
cm^-3
hi p dens
0.01
10.0
0.0
10000.0
-1.0000e+031
Ion
Scalar
NumberDensity
0.13
45
keV/e
LANL 02A MPA Velocity Vector High-E Ions
vel_hip
Velocity vector high-enery protons (.13-45 keV/e) in spacecraft Coordinates in units of km/s.
km/s
1.0e3>m s^-1
Cartesian
SC
-200
200
3
VX
Component.I
1
VY
Component.J
2
VZ
Component.K
3
-2000
2000
-1.0000e+031
Ion
Vector
Velocity
LANL 02A MPA Temperature High-E Ions
temp_hip
Temperature of high energy ions (.13-45 keV/e).
eV
high p temp
100
100000.0
2
Temp Parallel
Component.I
1
Temp Perpendicular
Component.J
2
0.0
50000.0
-1.0000e+031
Ion
Array
Temperature
0.13
45
keV/e
LANL 02A MPA Polar, Azimuthal Angle High-E Proton Symmetry Axis
theta_phi_hip
Proton symmetry axis: polar angle relative to Earth direction, azimuthal angle from the north.
deg
Spherical
SC
2
Polar Angle
DirectionAngle.PolarAngle
1
degrees
0
180
Azimuthal Angle
DirectionAngle.AzimuthAngle
2
degrees
-90
90
-1.0000e+031
Ion
Array
ArrivalDirection
0.13
45
keV/e
LANL 02A MPA Ratio of Temperature Eigenvalues for High-E Ions
tratio_hip
Ratio of temperature (Tperp/Tmid) of low energy ions (.13-45 keV/e).
Tper/Tmid
0.1
10.0
0.0
100.0
-1.0000e+031
Ion
Ratio
Temperature
0.13
45
keV/e
LANL 02A MPA Partial Density Electrons
dens_e
Partial density of electrons (.03-45 keV/q).
# cm^-3
elec dens
0.01
100.0
0.0
100000.0
-1.0000e+031
Electron
Scalar
NumberDensity
0.03
45
keV/e
LANL 02A MPA Temperature Electrons
temp_e
Temperature of electrons (.03-45 keV/q).
eV
Temperatures, parallel and perp. for electrons
100
100000.0
2
Temp Parallel
Component.I
1
Temp Perpendicular
Component.J
2
0.0
50000.0
-1.0000e+031
Electron
Array
Temperature
0.03
45
keV/e
LANL 02A MPA Polar, Azimuthal Angle Electron Symmetry Axis
theta_phi_e
Electron symmetry axis: polar angle relative to Earth direction, azimuthal angle from the north.
PT87S
Spherical
SC
2
Polar Angle
DirectionAngle.PolarAngle
1
degrees
0
180
Azimuthal Angle
DirectionAngle.AzimuthAngle
2
degrees
-90
90
-1.0000e+031
Electron
Array
ArrivalDirection
0.03
45
keV/e
LANL 02A MPA Ratio of Temperature Eigenvalues for Electrons
tratio_e
Ratio of temperature (Tperp/Tmid) of electrons (.03-45 keV/q).
Tper/Tmid
0.1
10.0
0.0
100.0
-1.0000e+031
Electron
Ratio
Temperature
0.03
45
keV/e
LANL 02A MPA Spacecraft Potential
sc_pot
Spacecraft potential in units of volts.
volts
S/C poten.
-10000.0
0.0
-20000.
0.0
-1.0000e+031
Scalar
Potential
LANL 02A MPA Background Count Rate (Not Clear what this is the background for)
bkgd
Background Count Rate.
cts/9ms
Backgrd
0.1
1000.0
0.0
1000.0
-1.0000e+031
Scalar
Other
LANL 02A MPA Spacecraft Position, Polar Geographic Coordinates
sc_pos_geo
Spacecraft position, polar geographic coordinates (radius,lat,long).
Spherical
GEO
3
Polar Geographic Coordinates.
Radius
Magnitude
1
EarthRadii
0
10
Latitude
DirectionAngle.ElevationAngle
2
degrees
-90
90
Longitude
DirectionAngle.AzimuthAngle
3
degrees
-180
180
-1.0000e+031
Vector
Positional
LANL 02A MPA Spacecraft Position, Cartesian Geocentric Celestial Inertial coordinates
sc_pos_syngci
Spacecraft position, cartesian coordinates (radius,lat,long). Geocentric Celestial Inertial, is earth centered, with the X-axis pointing from the Earth towards the first point of Aries (the position of the Sun at vernal equinox). This direction is the intersection of the Earth's equatorial plane and the ecliptic plane--thus the X-axis lies in both planes. The Z-axis is parallel to the rotation axis of the Earth, and the Y-axis completes a right-handed orthogonal coordinate system. The X-axis is the direction of the mean vernal equinox of J2000. This is a virtual variable generated by read_myCDF w/ useof the data in the sc_pos_geo variable and a conversion routinespecified in the function attribute, namely conv_pos.
PT87S
Cartesian
GEI
3
Geocentric Celestial Inertial coordinates.
X
Component.I
1
-1000
1000
Y
Component.J
2
-1000
1000
Z
Component.K
3
-1000
1000
-1.0000e+031
Vector
Positional
LANL 02A MPA Spacecraft Position, Polar Magnetic Coordinates
sc_pos_mag
Spacecraft position, polar magnetic coordinates (radius,lat,long).
Spherical
MAG
3
Polar Magnetic Coordinates.
Radius
Magnitude
1
EarthRadii
0
10
Latitude
DirectionAngle.ElevationAngle
2
degrees
-90
90
Magnetic Local Time
DirectionAngle.AzimuthAngle
3
hours
0
24
-1.0000e+031
Vector
Positional
LANL 02A MPA Data Quality Flag
qual_flag
Data quality flag. Data quality flag, 0 = ok, 1 = Results unreliable.
Qual Flag
0.0
10.0
0.0
10.0
-2147483648
Scalar
Other
LANL 02A MPA Data Gap Flag
gap_flag
Data gap flag. Data gap flag, 0 = No Gap, 10 = No data available.
Gap Flag
0.0
10.0
0.0
10.0
-2147483648
Scalar
Other
LANL 02A MPA Time Offset for Electron Measurements
offset_time
Time offset for electron measurements. Electron sample time is 21.5 seconds after that of ions.
ms
T offset
21500.0
21500.0
21500.0
21500.0
-1.0000e+031
Scalar
Temporal